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Top 15 Window form Interview
Questions & Answers

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Ans. System.Windows.Forms.Form
1. What base class do all Winforms inherit from?
2. How is anchoring different from docking?
Ans. Docking refers to attaching a control to either an
edge (top, right, bottom, or left) or the client area of the
parent control. On the other hand, anchoring is a process
in which you need to specify the distance that each edge
of your control maintains from the edges of the parent
control.

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3. What is the difference between pixels, points
and ems?
Ans. A pixel is the lowest-resolution dot the computer
monitor supports. Its size depends on users settings and
monitor size.
A point is always 1/72 of an inch.
An em is the number of pixels that it takes to display the
letter M.
4. How can you assign an RGB color to a
System.Drawing.Color object?
Ans. Call the static method FromArgb of this class and
pass it the RGB values.

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5.What is the difference between WindowsDefaultLocation
and WindowsDefaultBounds?
Ans. WindowsDefaultLocation tells the form to start up at
a location selected by OS, but with internally specified
size.
WindowsDefaultBounds delegates both size and starting
position choices to the OS.
6. How can you get or set the time between Timer ticks?
Ans. There is an Interval property, which is responsible to
get and set the time in milliseconds.

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7. How can we auto size a button to fit its text?
Ans. The Button control has the AutoSize property, which
can be set to true or false. If we set the value of the
AutoSize property to true, then the button control
automatically alters its size according to the content
displayed on it.
8. When would you use ErrorProvider control?
Ans. ErrorProvider control is used in Windows Forms
application. It is like Validation Control for ASP.NET
pages. ErrorProvider control is used to provide validations
in Windows forms and display user friendly messages to
the user if the validation fails.

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9. How do I make a TextBox use all upper-case (or lower-
case) characters?
Ans. Use the CharacterCasing property of the
TextBox.textBox1.CharacterCasing = CharacterCasing.Upper;
textBox2.CharacterCasing = CharacterCasing.Lower;
10. Write a simple Windows Forms MessageBox
statement.
Ans. The code is:
System.Windows.Forms.MessageBox.Show("Hello, Windows Forms");

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11. How would you create a non-rectangular window, let’s
say an ellipse?
Ans. Create a rectangular form, set the TransparencyKey
property to the same value as BackColor, which will
effectively make the background of the form transparent.
Then set the FormBorderStyle to FormBorderStyle.None,
which will remove the contour and contents of the form.
12. How do you create a separator in the Menu Designer?
Ans. A hyphen ‘-’ would do it. Also, an ampersand ‘&’
would underline the next letter.

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13. My progress bar freezes up and dialog window shows
blank, when an intensive background process takes over.
Ans. Yes, you should’ve multi-threaded your GUI, with
taskbar and main form being one thread, and the
background process being the other.
14. Why is it not a good idea to insert code into
InitializeComponent method when working with Visual
Studio?
Ans. The designer will likely throw it away; most of the
code inside InitializeComponent is auto-generated.

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15. How can you save the desired properties of Windows
Forms application?
Ans. .config files in .NET are supported through the API
to allow storing and retrieving information. They are
nothing more than simple XML files, sort of like what .ini
files were before for Win32 apps.

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